What is Isophorone Diisocyanate IPDI CAS 4098-71-9?

Isophorone Diisocyanate, commonly abbreviated IPDI, is a cycloaliphatic diisocyanate monomer with molecular formula C12H18N2O2. It is a reactive raw material for making light-stable polyurethane resins, not a finished coating or hardener.

Why is IPDI preferred over aromatic isocyanates for exterior applications?

IPDI is cycloaliphatic rather than aromatic, so polyurethanes made from it generally show better UV resistance and reduced yellowing. This makes it suitable for weather-resistant coatings, automotive refinish, flooring and other applications requiring long-term colour stability.

What NCO content and viscosity can be expected for IPDI monomer?

Commercial IPDI monomer typically has an isocyanate content around 37.5% or higher and appears as a clear to light-yellow, low-viscosity liquid. These properties make it useful for preparing prepolymers, trimer crosslinkers and high-solids coating resins.

Why must IPDI be protected from moisture?

Isocyanate groups react readily with water, which can generate carbon dioxide, reduce NCO content and cause pressure build-up in closed containers. IPDI should be stored under dry inert conditions and opened only in a moisture-controlled process.

Is IPDI monomer the same as an IPDI trimer or prepolymer?

No. This product is the monomeric diisocyanate. IPDI trimer and prepolymer grades are reaction products with different viscosity, NCO content, functionality and handling behaviour, so they are specified separately for the target resin or crosslinker.

Isophorone Diisocyanate (IPDI) CAS 4098-71-9

Isophorone Diisocyanate, commonly abbreviated IPDI, CAS 4098-71-9, is a cycloaliphatic diisocyanate raw material supplied for light-stable polyurethane resins and crosslinker intermediates. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 4098-71-9
Synonyms: IPDI, 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate
Einecs: 223-861-6
Molecular Formula: C₁₂H₁₈N₂O₂
Grade: Industrial IPDI monomer
Package: 200 kg steel drums; IBCs by agreement

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Product Description

Isophorone Diisocyanate (IPDI) CAS 4098-71-9 is 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, with EC 223-861-6 and molecular formula C₁₂H₁₈N₂O₂.

Synonyms: IPDI; 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate.

CAS: 4098-71-9.

Molecular formula: C₁₂H₁₈N₂O₂.

It is supplied as a clear to light-yellow, low-viscosity liquid.

It is positioned as a cycloaliphatic diisocyanate raw material for light-stable polyurethane resins and crosslinker intermediates.

It is monomeric IPDI and is not an IPDI trimer, prepolymer or finished polyurethane hardener.

It is used in polyurethane coatings, including durable industrial coating resin routes.

It is used in urethane adhesive and sealant prepolymer manufacture.

It is used in polyurethane dispersions and urethane-acrylate resin systems.

It is used in elastomer, cast-resin and specialised crosslinker production.

As a cycloaliphatic diisocyanate it gives polyurethanes better UV resistance and reduced yellowing than aromatic isocyanates.

Commercial monomer typically has an isocyanate content around 37.5% or higher.

Isocyanate groups react readily with water, so it must be protected from moisture to avoid carbon dioxide generation, reduced NCO content and pressure build-up.

Confirm monomeric IPDI identity, NCO content, colour and applicable purity or moisture controls.

Store under dry inert conditions and open only in a moisture-controlled process.

Use suitable PPE when handling and follow the supplied SDS.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Isophorone Diisocyanate IPDI CAS 4098-71-9?

A: Isophorone Diisocyanate, commonly abbreviated IPDI, is a cycloaliphatic diisocyanate monomer with molecular formula C12H18N2O2. It is a reactive raw material for making light-stable polyurethane resins, not a finished coating or hardener.
Q:
Why is IPDI preferred over aromatic isocyanates for exterior applications?

A: IPDI is cycloaliphatic rather than aromatic, so polyurethanes made from it generally show better UV resistance and reduced yellowing. This makes it suitable for weather-resistant coatings, automotive refinish, flooring and other applications requiring long-term colour stability.
Q:
What NCO content and viscosity can be expected for IPDI monomer?

A: Commercial IPDI monomer typically has an isocyanate content around 37.5% or higher and appears as a clear to light-yellow, low-viscosity liquid. These properties make it useful for preparing prepolymers, trimer crosslinkers and high-solids coating resins.
Q:
Why must IPDI be protected from moisture?

A: Isocyanate groups react readily with water, which can generate carbon dioxide, reduce NCO content and cause pressure build-up in closed containers. IPDI should be stored under dry inert conditions and opened only in a moisture-controlled process.
Q:
Is IPDI monomer the same as an IPDI trimer or prepolymer?

A: No. This product is the monomeric diisocyanate. IPDI trimer and prepolymer grades are reaction products with different viscosity, NCO content, functionality and handling behaviour, so they are specified separately for the target resin or crosslinker.

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